This example demonstrates basic serial features. This example opens one VISA resource and configures one COM port. It then performs a serial port read, a serial port write, or both based on the options (read or write) that the user selects on the front panel. If both are selected, the VI will first write data, then read data, and finally close the VISA session that is opened to the port. If a read is performed, this VI will wait until the specified number of bytes is received at the port.
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Only the number of bytes specified will be read. For more Serial examples please see the related resources or the LabVIEW Example Finder. To navigate to the LabVIEW example finder open LabVIEW and select Help Find Examples. The Example Finder window will open, from there you can open Hardware Input and Output Serial to find additional Serial examples. Related Resources.
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Overview of Serial Bus Serial is a common device communication protocol for instrument control because most computers and many remote instruments include at least one serial port. Single applications can be used across a variety of instruments with few modifications, reducing programming and test time. For more information on the serial protocol, including information on transfer speeds and important parameters, please refer to. Connecting and Setting up a Serial Instrument Control System Engineers typically use serial to transmit American Standard Code for Information Interchange (ASCII) data.
All data types are converted to strings of ASCII characters and then transmitted bit by bit across the serial bus. For two ports to communicate, both the instrument and the controlling computer must have the same baud rate, data bit size, stop bits, and parity.
A basic serial instrument control system consists of three parts: 1. PC (or controller) with a serial port 2. Serial cable 3. Serial instrument As mentioned, most computers include a serial port. The only hardware setup required is connecting the serial cable to the serial port on the PC and the serial port on the instrument. The serial instrument may include some hardware drivers or software utilities for communication, and should include documentation on the baud rate, packet size, stop bits, and parity bits that the instrument will use.
Additionally, check the National Instruments to see if LabVIEW drivers already exist for your instrument, as well has tutorials on how to use them. To confirm that the serial port on your computer is working properly, refer to, to see how to perform a serial loop back test. How to Create a VISA Resource for the Instrument in MAX With NI-VISA, communicating with your serial instrument is easy. To confirm that you are able to communicate with your instrument, open Measurement & Automation Explorer (MAX) found at StartProgramsNational InstrumentsMeasurement & Automation. MAX Main Menu Expand the Devices and Interfaces subdirectory below My System.
Below it you should see all the serial and parallel ports on your computer. In this example the computer has one serial port (“COM3”).
Figure 2 shows the directory path to the serial port and the configuration window when COM1 is selected. Serial Port Configuration Window From this configuration window you can change the VISA Alias for easier identification and you can also communicate with your instrument through a VISA Test Panel by selecting Open VISA Test Panel. Your instrument should have specific commands for collecting and transmitting data and you can use the VISA Test Panel to test these functions and verify that they are working properly. Using NI-VISA to Communicate with Your Serial Instrument NI-VISA makes serial instrument programming fast and easy. VISA Open, VISA Read, VISA Write, and VISA Close are the basic VISA functions in LabVIEW used in the example VI in Figure 3. This example opens a VISA session to a serial device. A command is written to the device, and the response is read back.
In this example the specific command being sent is the ID query for the device. Check with your device manufacturer for your device command set. After all communication is complete, the VISA session is closed. LabVIEW Serial Program Using NI-VISA NI-VISA provides built in serial examples to assist users with application design and development. Serial examples for LabVIEW can be found the in LabVIEW Example Finder by navigating to Help Find Examples Hardware Input and Output Serial.
The Readme file for each NI-VISA version provides more information on where to find LabVIEW Serial examples. Serial examples for.NET, C and VB6 can be found by navigating to Start All Apps National Instruments NI-VISA Examples. Related Resources. Free printable quarter roll wrappers. Kommentare.
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Hey arsh, In your Arduino code you never enable the serial port. You'll need to enable the serial port with Code: Serial.begin(9600) before it can receive any serial data. Next, as soon as you get a serial byte your Arduino code will infinitely loop on Code: while (Serial.available) since Serial.available will return 1 or more (which corresponds to true). You probably want Code: while (Serial.available. Thank you Sam.
Audio driver. 'while(serial.available), was really confusing. Thank you for clearing that up.
Instead of using multiple VISA Write blocks in a VI, I am now using a single VISA Write and in Arduino code I am using Serial.parseInt, I am now able to receive different forms of data from LabVIEW into Arduino. There is one thing though, If I set the Termination Char to TRUE, does that mean that the Buffer of VISA write will send a ' n' at the end of strings in each loop iteration? If Yes, then I will be able to use it as a condition in Arduino code and start Multiple VISA Reads (which is now giving me Nightmares) One more thing, I know its not relevant, I just updated my Windows to 8.1. I can't seem to find Arduino port in VISA Configuration block? I am using LabVIEW 2013.
I looked it up, NI sites with FAQs about Windows 8 issues suggested to restart the system. It did not work. Posts: 58 Joined: Tue Mar 31, 2015 9:07 am. Yes, if you enable termination characters it will send what ever you set as the termination character at the end of each VISA Write (default is ' n').
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Keep in mind that ' n' is 0x0A or decimal 10, so if your data byte happens to be 0x0A it will be treated as a termination character rather than a data byte by LabVIEW. Typically you'll only want to use a termination character if you're sending ASCII characters rather than raw numbers. In that case you'd send the value of 10 as ASCII characters '1' and '0'. Let us know if that makes sense.
As for the COM port, does the Arduino IDE work? You may have to update the Arduino drivers. This is getting really irritating. I was able to get data from arduino into labview through serial port and vice versa. But as soon as the computation increases, the data i am sending in arduino from labview gets mixed up (like variable 1 value in variable 2 and vice versa). So i thought i should increase the loop delay.
Sometimes it works fine other times, it starts mixomg again. I dont know what should i do. I also increased the baud rate to 115200.
Any suggestions? Posts: 58 Joined: Tue Mar 31, 2015 9:07 am.
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